Not sure what manifold you're looking at. OP's mani is not twin scroll, doc race initial mani is not twin scroll, but the doc revision is twin scroll. Look at it again. It is 1-2-3 and 4-5-6. Definitely not a proper twinscroll.

Originally Posted by Sered

From the pics I see, looks like its routed correctly to me.
1-5-3-6-2-4

Not sure what manifold you're looking at. OP's mani is not twin scroll, doc race initial mani is not twin scroll, but the doc revision is twin scroll. Look at it again. It is 1-2-3 and 4-5-6. Definitely not a proper twinscroll.

Sered listed the firing order. So for a twin scroll manifold, having 123 for one turbine and 456 for another would be proper routing because no single turbine will get two successive exhaust pulses. They will alternate from one turbine to the other based on the firing order given by Sered.

Sered listed the firing order. So for a twin scroll manifold, having 123 for one turbine and 456 for another would be proper routing because no single turbine will get two successive exhaust pulses. They will alternate from one turbine to the other based on the firing order given by Sered.

I was being silly. see my comments above. I'm one of the biggest advocates for selling a turbo mani only. I was just saying if you want anything doc race for the n54 right now, VTT ST3 is the only thing they're making.

Originally Posted by 654

No, that is called a turbo kit rather than an exhaust manifold for ST. The manifoldS for the kit are very different from the ST manifold. The only common factor is the fabricator. The twin manis look similar to stock manis. Short simple runners. The link to the ST mani is in my previous post.

maybe the fitment issues were with the turbo itself? relocating the coolant res and crap..?

shiv's one is mounted next to the block in this weird cramped mess is it not?

The Doc Race built manifold was bottom mount (built for HPF). It looked similar to the FFTEC manifold, but was twin-scroll. I beileve they said the tubes were too close to the valve cover, but they never posted pictures of it installed.

The Doc Race built manifold was bottom mount (built for HPF). It looked similar to the FFTEC manifold, but was twin-scroll. I beileve they said the tubes were too close to the valve cover, but they never posted pictures of it installed.

oh it faces down? yeah facing down, those runners would get REALLY close i reckon...

i was imagining it the other way, with the outlet ending up behind ish the head light ...

they should scrap it and make a top mount mani... now that we have the ability to fit a turbo up there.

get the RHD market in the game

why should they scrap the bottom mount if it fits. The bottom mount has more room for unrestricted intake routing. More options, more better. As for fftec's manifold, it is not a mess at all. It's quite beautiful actually. I have one sitting at home right now. Once I get around to installing and fine tuning, I'll put a thread together for it.

Sered listed the firing order. So for a twin scroll manifold, having 123 for one turbine and 456 for another would be proper routing because no single turbine will get two successive exhaust pulses. They will alternate from one turbine to the other based on the firing order given by Sered.

Yup, I posted the firing order because I6 motors only have one (that I know of) and since it's balanced it makes it easy to make a twinscroll out of it

why should they scrap the bottom mount if it fits. The bottom mount has more room for unrestricted intake routing. More options, more better. As for fftec's manifold, it is not a mess at all. It's quite beautiful actually. I have one sitting at home right now. Once I get around to installing and fine tuning, I'll put a thread together for it.

Agreed with this. But I do want the RHD people to get some love too, plus a top-mount just looks awesome. They should begin working on a top-mount

I would buy a manifold in a heartbeat at bigdnno stated. I can put a single turbo kit together, that's not too hard to customize.The TT kit is the hard one and that way I'd just buy the whole Vargas stage3 kit.

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why should they scrap the bottom mount if it fits. The bottom mount has more room for unrestricted intake routing. More options, more better. As for fftec's manifold, it is not a mess at all. It's quite beautiful actually. I have one sitting at home right now. Once I get around to installing and fine tuning, I'll put a thread together for it.

how is there more room for intake routing?

in a top mount, you can just either run a filter straight off the turbo, or path a short tube to above the intake manifold?.. you have more room to fit larger turbos (and again, fits RHD)

yeah more options is always better, but there's a much much larger market for the top mount manifold? there's a lot more advantages in running that i'd think?

in a top mount, you can just either run a filter straight off the turbo, or path a short tube to above the intake manifold?.. you have more room to fit larger turbos (and again, fits RHD)

yeah more options is always better, but there's a much much larger market for the top mount manifold? there's a lot more advantages in running that i'd think?

you clearly haven't looked closely at the top mount turbos. From the ones I have seen for the n54, you either have to run a sharp 90* elbow off the turbo inlet or run without a filter. With the lower mounted turbo, you have a little more distance before you have to make that bend. Therefore you have more room. Make sense? On under mounted, you can also run a larger radiused bend because of the extra room.

I took careful consideration to make sure I could fit a decent filter on my top-mount. Although I built a 3" intake that positions a large filter over the intake manifold, I also have a filter that goes directly on the turbo for "race mode" (guess which I use more LOL). I believe it's the same filter used on the FFTEC kits and should provide plenty of flow. Here are the specs:

you clearly haven't looked closely at the top mount turbos. From the ones I have seen for the n54, you either have to run a sharp 90* elbow off the turbo inlet or run without a filter. With the lower mounted turbo, you have a little more distance before you have to make that bend. Therefore you have more room. Make sense? On under mounted, you can also run a larger radiused bend because of the extra room.

fair enough

but you still can't fit as large a turbo, and RHD guys don't have a choice.

and your exhaust manifold is much more cramped. lots less space to work with.